Austin’s Infamous Brewing collaborated with the nationally recognized Boston Beer Co., maker of Samuel Adams beers, to create BOS X AUS, a limited-edition smoked oyster stout that will be on tap at the March 12 event and at a small amount of local bars and restaurants near the festival.

The two breweries teamed up in part because of their history together: Infamous took part in Samuel Adams’ Brewing the American Dream program a few years ago — the same competition that the Boston brewery is staging during SXSW. Samuel Adams’ Pop-Up Pitch Room Competition runs from 3 to 5:30 p.m. March 12 at Whole Foods.

At the competition, business owners have two minutes to present the merits of their product and business to a panel of expert judges, who will then decide whose pitch is the winner based on factors like passion, creativity and quality of the presentation.

Samuel Adams brewer Jennifer Glanville, who was among the Boston Beer crew that traveled to Austin to produce BOS X AUS at Infamous, will be one of the judges, along with Lockhart Steele, co-founder of Eater.com, and two others.

“We’re privileged to create a unique brew with a truly pioneering company!” Infamous Brewing wrote on Facebook last month. “Our BOS x AUS Smoked Oyster Stout will surely be one for the books. Working alongside such experienced and knowledgeable brewers is a humbling endeavor.”

Boston Beer Co. founder Jim Koch started up Brewing the American Dream as a way to share financial help and business advice that he wishes he’d had starting the brewery 33 years ago.